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KVM: selftests: Make number of vCPUs configurable in IRQ test

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Extend the eventfd IRQ test with a '-v' flag to allow the user to
configure the number of vCPUs to create and run (versus only ever using a
single vCPU).

Update the routing logic to play nice with 32 bit IDs, enable x2APIC format
in KVM (to enable 32-bit ID routing), and disable KVM's x2APIC broadcast
quirk so that targeting vCPU 255 doesn't blast the interrupt to all vCPUs
when in x2APIC mode.

Signed-off-by: David Matlack <dmatlack@google.com>
Co-developed-by: Josh Hilke <jrhilke@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Link: https://patch.msgid.link/20260626213534.3866178-20-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
David Matlack 2026-06-26 14:35:32 -07:00 committed by Sean Christopherson
parent 6b9470baea
commit 0315713a19
1 changed files with 13 additions and 3 deletions
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16
tools/testing/selftests/kvm/irq_test.c
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@ -124,7 +124,8 @@ static void kvm_route_msi(struct kvm_vm *vm, u32 gsi, struct kvm_vcpu *vcpu,
.entry = {
.gsi = gsi,
.type = KVM_IRQ_ROUTING_MSI,
.u.msi.address_lo = 0xFEE00000 | (vcpu->id << 12),
.u.msi.address_lo = 0xFEE00000 | (vcpu->id & GENMASK(7, 0)) << 12,
.u.msi.address_hi = vcpu->id & GENMASK(31, 8),
.u.msi.data = use_nmi ? NMI_VECTOR | (4 << 8) : vector,
},
};
@ -157,7 +158,7 @@ static const char *probe_iommu_type(void)
static void help(const char *name)
{
printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-e] [-h] [-i nr_irqs] [-m] [-n] [-t iommu_type]\n", name);
printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-e] [-h] [-i nr_irqs] [-m] [-n] [-t iommu_type] [-v nr_vcpus]\n", name);
printf("\n");
printf("Tests KVM interrupt routing and delivery via irqfd.\n");
printf("-a Affine the device's host IRQ to a random physical CPU\n");
@ -167,6 +168,7 @@ static void help(const char *name)
printf("-m Pin target vCPU to random physical CPU before triggering interrupt\n");
printf("-n Deliver 50 percent of IRQs as non-maskable interrupts\n");
printf("-t Override the IOMMU type to use (vfio_type1_iommu or iommufd)\n");
printf("-v Number of vCPUS to run\n");
printf("\n");
exit(KSFT_FAIL);
}
@ -203,7 +205,7 @@ int main(int argc, char **argv)
struct kvm_vm *vm;
int irq, irq_cpu;
while ((c = getopt(argc, argv, "ad:ehi:mnt:")) != -1) {
while ((c = getopt(argc, argv, "ad:ehi:mnt:v:")) != -1) {
switch (c) {
case 'a':
irq_affinity = true;
@ -226,6 +228,11 @@ int main(int argc, char **argv)
case 't':
iommu_type = optarg;
break;
case 'v':
nr_vcpus = atoi_positive("Number of vCPUS", optarg);
TEST_ASSERT(nr_vcpus <= KVM_MAX_VCPUS,
"KVM selftests support at most %u vCPUs", KVM_MAX_VCPUS);
break;
case 'h':
default:
help(argv[0]);
@ -235,6 +242,9 @@ int main(int argc, char **argv)
TEST_REQUIRE(kvm_arch_has_default_irqchip());
vm = vm_create_with_vcpus(nr_vcpus, guest_code, vcpus);
vm_enable_cap(vm, KVM_CAP_X2APIC_API, KVM_X2APIC_API_USE_32BIT_IDS |
KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK);
vm_install_exception_handler(vm, vector, guest_irq_handler);
vm_install_exception_handler(vm, NMI_VECTOR, guest_nmi_handler);